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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cf00d0400cb5f8be49a51db6a7486928d05448b9c9b1d656e6d2a5bdd63aab' 
  AND token = 'CW5yv3NdiZIi/xKd3fDPx19JrUg9mv4piED8VBaFbw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}